Created attachment 314619 [details]
Example tracked song for reproducing the bug.

Playing a "tracked" song (mod, xm, s3m, etc...) will not start the playback in rhythmbox.
The interface does not freeze, but the song does not start playing and I am unable to play any other song afterwards. I have to kill rhythmbox and restart it to be able to play any other music in it.
Launching from the terminal does not show any errors.

This **might** not be an error in gstreamer, since I can play this type of music on totem, and issuing:

gst-launch-1.0 -v playbin uri=file:///oath/to/a/song.xm

will work as expected.
Trying this on Archlinux x86_64, with all updates as of today. I don't know for how long this has been occurring, since I haven't listened to tracked music in a while using rhythmbox.

Attached is an example of a tracked music you can use to test. (You can find more here: http://modarchive.org/)